You are buying a Single Small End Conrod Needle Roller Bearing. These are end of line stock so once they have gone then

 they have gone.

To fit:

Aprilia

AF1 50 1993-1995

RS 50 1997-2004

RX50 1996-2004

AP8509769

I.d = 12mm

O.d = 15mm

Length = 15mm

Be confident in buying from a parts person who has had 30 years experience working at Hi-Level

 wholesaler within the motorcycle parts industry. I have decided to use my decades of knowledge to sell

 all types of classic motorcycle parts on here. 

Checkout my feedback on how quick we are for deliveries